vscode-extension-samples/lsp-user-input-sample/.vscode/launch.json

// A launch configuration that compiles the extension and then opens it inside a new window
{
	"version": "0.2.0",
	"configurations": [
		{
			"type": "extensionHost",
			"request": "launch",
			"name": "Launch Client",
			"runtimeExecutable": "${execPath}",
			"args": ["--extensionDevelopmentPath=${workspaceFolder}" ],
			"autoAttachChildProcesses": true,
			"sourceMaps": true,
			"outFiles": [
				"${workspaceRoot}/client/out/**/*.js",
				"${workspaceRoot}/server/out/**/*.js"
			],
			"preLaunchTask": "npm: watch"
		}
	]
}